My Car Looks like a Miami Vice Rerun

The award for bonehead move of the week definitely goes to me. I was getting breakfast for co-workers yesterday and while in the grocery store grabbed  a few items for another recipe. I put everything in my car and when I came in to work, I was loaded down with stuff so I left the groceries for later in my backseat until I could get them.

I should've known better because as soon as I set my stuff down, I got whisked into an impromptu meeting, had calls to return and BOOM! The day started. I forgot about my car groceries, which sat in the not so hot, but always sunny backseat of my car, Liam Nissan. 

One of the groceries: a pound of butter. 

So I drive home in a car that smells like it should be used to coat popcorn and my back passenger side seat is an oily mess. I research online and see that after wiping up what I can, the recommended thing to do is coat the area with baking soda or cornstarch to absorb the mess. So I do, but then I wonder if passersby will think that I had an accident and that I have a big pile of cocaine in my backseat. I know it's not likely, but my neighbor is on the cusp of an area where that probably isn't too big of a stretch, so I covered the pile of cornstarch with a towel.

So now my car is retro because it's in to coke. Or at least it feels that way. It seems like its a prop from Miami Vice (the TV show not the horrible movie). 

Does anyone have any better ideas on how to get melted butter out of  car upholstery?